Heads and cam will make a nice upgrade and still stay legal. Tuning will be very important also
I hear that some guys are passing the CA emmissions test with cams as large as 224║ on 114║lsa. My '01 truck with 5.3l engine and 214║ cam with 112║lsa easily passed the CA tests. Next year I have to test the SS but I don't expect any problems with the 220║ cam and no headers.